Tried this "taming" method on official servers and on singleplayer both. Did not work. Used 12 bulbdogs on one, on the other 11 bulbdogs and 10 shinehorns. I had a trap for the seekers with a 1x1 box border around it, lightpets pressed against the wall. I even threw 50 glowsticks in the box with the seekers. No tame. I demoed the middle walls to see if they were blocking the light, and still no taming. Reckon the comments saying you can are just messing with you to waste your time. Or they are on unofficial/modded servers.
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Method Of Taming Seekers?
Let it kill / suck the charge off a light tame (maybe Troodon like)
Attack a Seeker with the Charge Lantern for a while.
Trap a Seeker and put down a Charge Lantern for it.